[CW] Speed vs Bandwidth

[Bill Evans]

On the other hand, I think that this is a significant issue
and have much enjoyed following the thread.

Bill Evans  VE4UD

----- Original Message ----- 
From: "Pedro J. Santa" <pjs123@attglobal.net>
To: "David J. Ring, Jr." <n1ea@arrl.net>; "George, W5YR"
<w5yr@att.net>; <cw@mailman.qth.net>
Sent: Monday, March 15, 2004 10:40 PM
Subject: [CW] Speed vs Bandwidth


> Hi all:
>
> I've been following (or trying to) the multiple exchanges
on the referenced
> topic--most of which are really devoted to esotheric
postulates and futile
> diatribes, to say the least.. I don't think I've learned
much of any
> significance from this long, just too long,  string of
messages regarding
> this impractical and theoretic subject.  I can only say
that this hogwash
> has not really added much, if anything, to my enjoyment of
the hobby--much
> less to my passion for Morse Code.  If our younger fellows
were reading the
> colloquy about this nonsense, they would just join the
ranks of those who
> claim we ham radio operators have "lost it"...
>
> 73 Pedro..
>
> P.S. Morse Code is forever...
>
> 73 Pedro KP3X----- Original Message ----- 
> From: "David J. Ring, Jr." <n1ea@arrl.net>
> To: "George, W5YR" <w5yr@att.net>; <cw@mailman.qth.net>
> Sent: Tuesday, March 16, 2004 12:09 AM
> Subject: [CW] We agree - Speed vs Bandwidth
>
>
> > W5YR wrote:
> >
> > Grab your 2003 ARRL Handbook and look at Fig. 12.21 on
Page 12.13 - I
> > imagine that the 2004 and 2002 books have the same
content in about the
> same
> > location.
> >
> > Fig. 12.21 is a graph that relates bandwidth to
rise/fall time. Keying
> speed
> > does not enter into the graph at all for the spectral
width determination.
> > It does indicate the maximum keying rate for a K=3 and a
K=5 circuit for a
> > given bandwidth. Nowhere in the material on CW keying
could I find any
> > mention of keying rate influencing bandwidth.
> >
>
////////////////////////////////////////////////////////////
///////////////
> >
> > I really wold like to see what they say for maximum
keying rate at K=3 and
> > K=5 - can you post that?
> >
> > I agree with you - and your observations agree with
me! - the bandwidth
> goes
> > up with code speed, but the bandwidth is much more
affected by the wave
> > shape.
> >
> > So - we've exhausted that interesting topic.  We agree!
How boring!
> >
> > I might make a sound file and feed it into my IC-756PRO
and change the
> > "voice rate" as I mentioned - that would be a hoot.  I
am sure the
> bandwidth
> > would go up with the voice rate pulses - so we could
have a new thread
> about
> > bandwidth goes up when you talk fast (or at least if you
make faster
> > pulses!)  But we need a new email reflector - how about
"CW guys who think
> > they're SSB operators" email list?
> >
> > George, you can find the relationship between keying
speed (baud or baudot
> > rate) and bandwidth here on the ITU web site:
> >
> > http://life.itu.ch/radioclub/rr/sm1138.htm
> >
> >
> > AMPLITUDE MODULATION
> > 1. Signal with Quantized or Digital Information
Continuous wave
> telegraphy,
> > Morse code Bn = BK
> > K = 5 for fading circuits
> > K = 3 for non�fading circuits
> >
> > 25 words per minute; B = 20, K = 5  Bandwidth:100 Hz
> >
> > Telegraphy by on-off keying of a tone modulated
> > carrier, Morse code Bn = BK + 2M
> > K = 5 for fading circuits
> > K = 3 for non�fading circuits
> >
> > 25 words per minute; B = 20, M = 1 000, K = 5
> > Bandwidth: 2 100 Hz
> >
> > 73
> >
> > David Ring, N1EA
> >
> > _______________________________________________
> > CW mailing list
> > CW@mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/cw
>
> _______________________________________________
> CW mailing list
> CW@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/cw
>